About 1 in 12 AS 618 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (9%); 0.6% were cancelled. The typical flight landed 16 minutes early.
AS 618: SEA → STL
Scheduled to leave Seattle at 7:55 a.m. local time. Over the past year it arrived on time 91% of the time (163 flights), worse than other AS flights on the route at that hour (95%). Last seen in the data Aug 18, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 24 | 96% |
| Tuesday | 24 | 100% |
| Wednesday | 24 | 92% |
| Thursday | 24 | 83% |
| Friday | 24 | 92% |
| Saturday | 19 | — |
| Sunday | 24 | 88% |
Why it was late
All flights SEA → STL · Connecting off AS 618? Check the risk
AS 618: STL → SEA
Scheduled to leave St. Louis at 2:50 p.m. local time. Over the past year it arrived on time 84% of the time (129 flights), worse than other AS flights on the route at that hour (87%). Last seen in the data Aug 18, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 19 | — |
| Tuesday | 19 | — |
| Wednesday | 20 | 90% |
| Thursday | 19 | — |
| Friday | 19 | — |
| Saturday | 14 | — |
| Sunday | 19 | — |
Why it was late
All flights STL → SEA · Connecting off AS 618? Check the risk
Questions
How often is AS 618 from SEA to STL late?
Alaska Airlines 618 from Seattle, WA to St. Louis, MO arrived 15 or more minutes late, was diverted or was cancelled on 9% of 163 scheduled flights between September 2025 and August 2026. 0.6% were cancelled.
How often is AS 618 from STL to SEA late?
Alaska Airlines 618 from St. Louis, MO to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 16% of 129 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.